Veteran actor Peter Coyote ("Erin Brockovich," "E.T.: The Extra Terrestrial") will be a special guest star in several episodes of ABC's hit freshman drama series, "Brothers & Sisters." Coyote will play Mark August, a professor and potential romantic interest to the very recently widowed Nora Walker. He makes his debut in an upcoming episode entitled "All in the Family."

Ken Olin ("Alias," "thirtysomething"), Jon Robin Baitz ("The Substance of Fire," "The West Wing") and Greg Berlanti ("Everwood") are executive producers. The series is produced by ABC Television Studio.